Ali has 2600 pens.
the amount of pens Ali has left after he gave away 1547 pens.
subtract 2600 from 1547.
hence, Ali has 1053 pens left with him after giving 1547 pens away.
2600 pens.
the remaining pens Ali have after giving 1547 away.
2600 - 1547
= 1053
so, Ali has 1053 pens with him.
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